The 4.6 tonne red siren, dubbed 'The Defender', which will be used during the memorial day ceremony, can be heard from up to 30km away. Photo: The Global Times

China tests world’s largest air-raid siren ahead of first official Nanking massacre memorial day

The 4.6 tonne red siren, dubbed 'The Defender', which will be used during the memorial day ceremony, can be heard from up to 30km away. Photo: The Global Times
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